int initUser_simple(unsigned char* pub, int pubLen, unsigned char* prv, int privLen, unsigned char* dec, int decLen);

int initUser_slidingWindow(unsigned char* pub, int pubLen, unsigned char* prv, int privLen,
unsigned char* dec, int decLen, unsigned char* mask, int maskLen, int beta);

int decrypt_simple(unsigned char* cipher, unsigned char *originalCipher);

int decrypt_slidingWindow(unsigned char* cipher, unsigned char *originalCipher, int windowIndex);
